芝加哥市将有一条与其摩天大楼一样富有魅力的下水道系统。新建的隧洞及水库,可存蓄雨水和污水。这些水每年要溢入运河一百次。大暴雨时还淹没广场、地下室,并流入密执安湖。一九八六年的杰出工程干线隧洞干线隧洞投入运行后,第一年就在芝加哥大部分市区和15个郊区共计204平方英里(530平方公里)范围内消除了80％的暴雨及污水的联合污染。干线隧洞长31mile(50km),创世界上坚硬岩石最大隧洞新纪 The city of Chicago will have an attractive sewer system as its skyscraper. Newly built tunnels and reservoirs save rainwater and sewage. The water spills into the canal a hundred times a year. Heavy storm also flooded the plaza, basement, and into Lake Michigan. In 1986, the first phase of the Outstanding Engineering trunk tunnel culvert was put into operation. In the first year, it eliminated about 80% of the total storm and sewage in a total of 204 square miles (530 square kilometers) in most of downtown Chicago and 15 suburbs Joint pollution. The main tunnel is 31mile (50km) long, creating the largest new tunnel of hard rock in the world